Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantos candidatos concorreram na eleição no distrito 4 de Arkansas?
 ###Tabelas: CREATE TABLE the_seven_ancient_wonders (the_seven_ancient_wonders_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Date of construction VARCHAR, Builder VARCHAR, Date of destruction VARCHAR, Cause of destruction VARCHAR, Modern location VARCHAR) CREATE TABLE table_of_federal_taxation_and_spending_by_state (table_of_federal_taxation_and_spending_by_state_id AUTO_INCREMENT PRIMARY KEY, Rank INT, State VARCHAR, Revenue (millions) VARCHAR, Population INT, Revenue per capita VARCHAR, Spending (millions) VARCHAR, Spending per capita VARCHAR, Net contribution per capita VARCHAR, Presidential majority 2000/2004 VARCHAR, Presidential majority 2008 VARCHAR, Presidential majority 2012 VARCHAR, Obamacare: Fed/ State/ Partnership VARCHAR) CREATE TABLE individual_2007_uci_protour_standings_after_race (individual_2007_uci_protour_standings_after_race_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Previous Rank VARCHAR, Name VARCHAR, Nationality VARCHAR, Team VARCHAR, Points INT) CREATE TABLE michigan_51_indiana_0 (michigan_51_indiana_0_id AUTO_INCREMENT PRIMARY KEY, Player VARCHAR, Position VARCHAR, Starter VARCHAR, Touchdowns INT, Extra points INT, Field goals INT, Points INT) CREATE TABLE  (_id AUTO_INCREMENT PRIMARY KEY, District VARCHAR, Incumbent VARCHAR, Party VARCHAR, First elected INT, Result VARCHAR, Candidates VARCHAR)  
SELECT COUNT Candidates FROM  WHERE District = Arkansas 4